Anyone using this fuel pump?

[Bort62]

http://cgi.ebay.com/ebaymotors/GSL392-W ... enameZWDVW

Walbro GSL-392 Inline High Pressure...

I've had good experience with Walbro in general. Any downside?

Thanks.

 

[hasa68mustang]

I believe the biggest thing you will have to look for would be the correct volume at whatever psi you require.

I dont remember any of the websites that fordsixers supplied to me when I was lookign into an electric pump. Ill try to find one of my posts about it.

another edit - not that this is the pump you are interested in it is one that someone else it using sucsessfully (does10s)

We're using a Mallory 4309 regulator. It's boost referenced and we've had it up to 28psi. The fuel pump is a Carter Inline EFI pump capable of flowing enough fuel for 550hp. Fuel lines are 3/8" aluminum (AN-6) with a 1/2" (AN- pickup in the tank. The return line is routed into the fuel tank filler neck.
Piece of cake!
Will

one more edit, I ould talke to kirk about this pump as it appears he is also using the walbro. heres another link.... and Im done editing this post lol he also posted some of the math involved in selecting the correct pump.

http://fordsix.com/forum/viewtopic.php?t=40775

 

[Does10s]

Ian,
That one is very similar to the one we were using. Just make sure you use the proper regulator and return line.
We're now using an Aeromotive Tsunami pump.
Later,
Will

 

[Bort62]

Ian,
That one is very similar to the one we were using. Just make sure you use the proper regulator and return line.
We're now using an Aeromotive Tsunami pump.
Later,
Will

Thanks Will. I've got the regulator & return all worked up already. I am currently running an intake EFI pump but I am going to switch back to the stock tank and would like to go to an external pump.

 

[kirkallen143]

That is the one I am using with the Aeromotive 13-301 bypass regulator.

This pump will even handle EFI if you go that direction. AND, it is a very, very quiet pump. Mount it as close to the tank as you can, mount the pump lower than the fuel outlet from the tank, use a relay and power switch from a good ignition source, good grounds, and you will be trouble free. 1 1/2 years and still going.

Make sure you use a larger return (mine 1/2") than your feed (mine 3/8").

Kirk

 

[Bort62]

That is the one I am using with the Aeromotive 13-301 bypass regulator.

This pump will even handle EFI if you go that direction. AND, it is a very, very quiet pump. Mount it as close to the tank as you can, mount the pump lower than the fuel outlet from the tank, use a relay and power switch from a good ignition source, good grounds, and you will be trouble free. 1 1/2 years and still going.

Make sure you use a larger return (mine 1/2") than your feed (mine 3/8").

Kirk

I am using a 3/8" feed & return, and I fail to see why this would be a problem.

 

[kirkallen143]

The larger return allows you to run lower psi at the regulator, and is supposed to help pump run cooler with less back pressure.

This is a direct quote from Brett at Aeromotive over at turbomustangs:

"The return line size is a function of the maxumun fuel required to be returned, the length of the return line and the base pressure you plan to run. In other words, it needs to be big enough that all the fuel the pump can pump will be able to return to the tank with less back pressure than the regulator is actually set for."


Kirk

 

[Bort62]

The larger return allows you to run lower psi at the regulator, and is supposed to help pump run cooler with less back pressure.

This is a direct quote from Brett at Aeromotive over at turbomustangs:

"The return line size is a function of the maxumun fuel required to be returned, the length of the return line and the base pressure you plan to run. In other words, it needs to be big enough that all the fuel the pump can pump will be able to return to the tank with less back pressure than the regulator is actually set for."


Kirk

Sure, I won't disagree with that...

Still don't see why it needs to be larger than the supply

 

[wallaka]

You don't want ANY backpressure on the return. If there is, the regulator won't be working as well as it should. There isn't a pump on the return, so it is essentially unpressurized except through the regulator's bleed-off. Going to a return with a bigger volume mitigates the fact that the line has less pressure, and helps the regulator keep working well without piling fuel up in front of the pump.

 

[addo]

I feel it's one of those "theory vs practicality" moments. In theory, no extra size needed. But if in reality you have a tight bend, or accidentally crush the line slightly and don't notice it - then the extra bore size is a good value.

 

[Bort62]

I feel it's one of those "theory vs practicality" moments. In theory, no extra size needed. But if in reality you have a tight bend, or accidentally crush the line slightly and don't notice it - then the extra bore size is a good value.

Well in this case, I'm hanging w/ theory

 

[wallaka]

It's just insurance.

 

[mentorcouple]

Perhaps this might help a little in the understanding why a larger tube size was recommended. First of all, no regulating (or relief) valve likes back pressure on the bypass port. This could affect the accuracy of the valve in performing its set function. Such as regulating gasoline flow at 6 psi (or whatever). A bypass line could be 20 ft. long on a car or truck. The majority of the pressure in the bypass line comes from the friction of the fluid going through the line. The larger the line, the less pressure drop, thus less back pressure. Hope it helps a little.

 

[Bort62]

Perhaps this might help a little in the understanding why a larger tube size was recommended. First of all, no regulating (or relief) valve likes back pressure on the bypass port. This could affect the accuracy of the valve in performing its set function. Such as regulating gasoline flow at 6 psi (or whatever). A bypass line could be 20 ft. long on a car or truck. The majority of the pressure in the bypass line comes from the friction of the fluid going through the line. The larger the line, the less pressure drop, thus less back pressure. Hope it helps a little.

Thanks, but I understand that perfectly well I know way too much about pressure drop... haha

However, velocity here is quite low. I'm not really worried about it.

 

[Lazy JW]

A 3/8" return line at 6 psi will have an incredibly small amount of line friction. I also fail to see any drawback.
Joe

 

[Bort62]

A 3/8" return line at 6 psi will have an incredibly small amount of line friction. I also fail to see any drawback.
Joe

Wtf Joe, you and I aren't supposed to agree on anything...

 

[Bort62]

I should add that I am already running a high-pressure in tank pump, and it works fine w/ a -6 feed/return.

I want to move to an external pump, hence the above question.

 

[Does10s]

Ian,
I agree with the larger return line but FWIW I've never run it that way.
We were running -6 (3/8") both ways and now have increased that to -8 (1/2") both directions.
We did run in the 10's and low 11's with the -6 and the same basic pump you're running.

Will

 

[Bort62]

I would probably revise the statement that the return must be larger than the feed to:

"The return must be sufficiently large as to ensure that, at target flow rates, the return pressure drop does not exceed the minimum regulator set pressure"

Pressure drop is a factor of line diameter, length, # and style of bends, and most importantly, flow rate of the fluid. As long as your return line from the regulator pressure drop does not exceed your operation pressure, say 6 psi, then it doesnt really matter... and it also doesnt matter how huge or small your feed line is as long as it can deliver the required flow rate to the engine.

 

[Lazy JW]

The obvious solution to a too-small return line is to burn more fuel Go for the gusto, turn up the BOOST man
Joe